Big o, little o, what begins with o

Despite all appearances, this is not a Dr. Seuss story.  I find it troubling that all branches of Christendom (Protestant, Roman Catholic and Orthodox) believe themselves to be orthodox.  Of the hundreds (or more) of denominations that exist, with a wide array of beliefs, all of these groups consider themselves orthodox.  How does this fit into reality?
The answer can only be one of three options.  One, only one group is right, two, none of these groups are right, and three, all of the doctrinal distinctions don't really matter.  From what I can ascertain, these are the only options.  All of these groups claim orthodoxy, usually based upon their interpretation of the Bible.  But again, someone or maybe all may be wrong in their interpretive endeavors.  All of them cannot be correct.  This point is even stronger when one considers the exclusive claims made by some of these groups.
We could continually reduce and simplify the basic claims until they find a point of unity.  But doing so would reduce the system of Christianity to almost an  unrecognizable monster.  And I think doing so would change the very essence and distinctiveness of the Christian faith.  I don't believe that anyone would want this.
What is the point of all of this?  I'm not sure.  But it is troublesome and thought provoking.  And it doesn't paint a very helpful picture for those outside of Christianity either.